Charles Cornwallis, 1st Marquess Cornwallis (1738–1805) was a British Army officer and colonial administrator.

Cornwallis may also refer to:

• Cornwallis Island (South Shetland Islands)

• Cornwallis, New South Wales
• Dauan Island or Cornwallis Island, one of the Torres Strait Islands

• Cornwallis, Manitoba (rural municipality)
• Cornwallis Island (Nunavut)
• Cornwallis River, Kings County, Nova Scotia
• Cornwallis Township, Kings County, Nova Scotia
• Cornwallis Park, Nova Scotia
• Cornwallis Square, Nova Scotia
• Cornwallis Junior High School in Halifax
• CFB Cornwallis, a former Canadian Forces Base
• Little Cornwallis Island, Nunavut

• Cornwallis, New Zealand, Auckland Region
  • Cornwallis Beach

• Cornwallis Academy, Kent, England

• Cornwallis, West Virginia

• Cornwallis Valley Railway, a branchline of the Dominion Atlantic Railway
• SS Cornwallis, a Canadian freighter attacked by German submarine U-514
• HMS Cornwallis, several ships of the Royal Navy
• Cornwallis, one of several 18th-19th century vessels
• Fort Cornwallis, a star fort built by the British East India Company in Penang, present-day Malaysia

• Kinahan Cornwallis (1883–1959), British diplomat
• Thomas Cornwallis (1605–1675), one of the first commissioners of the Province of Maryland (brother of Sir William)
• Thomas Cornwallis (died 1604), MP for Grampound
• Sir William Cornwallis (died 1614) (c. 1579 – 1614), British essayist
• George Cornwallis-West (1874–1951), stepfather of Winston Churchill

• Baron Cornwallis
• Earl Cornwallis
• Marquess Cornwallis

• Charles Cornwallis, 3rd Baron Cornwallis (1655–1698), who served as First Lord of the Admiralty
• Edward Cornwallis (1713–1776), British colonialist and founder of Halifax, Canada
• Frederick Cornwallis (1713–1783), Archbishop of Canterbury
• Sir William Cornwallis (1744–1819), British admiral during the Napoleonic Wars

• William Cornwallis Symonds (1810–1841), British officer in New Zealand

• All pages with titles containing Cornwallis
• Cornwall (disambiguation)
• Cornouailles (Cornish: Kernow), England, UK
• Cornouaille (Breton: Kernev), Brittany, France
• Cornouaille (disambiguation)
• All pages with titles beginning with Cornwallis
• All pages with titles containing Cornwallis